|
Title: Multiple choice question [urgent] Post by: mikaso on Feb 21, 2015 Hello guys, I need help with this multiple choice question. I am thinking the answer is A but I am not sure.
Over a period of just fifteen years ending in 2006, the mountain pine beetle has killed an estimated twenty millions acres of trees in the Rocky Mountains of British Columbia. These dead trees, in addition to no longer photosynthesizing to remove CO2 from the atmosphere, will actually emit it during their decomposition. As of 2013, the mountain pine beetle has since killed about 50% of the total volume of commercial lodgepole pine in BC. The beetles, and a fungus with which they are often infected, together damage the xylem cells, which causes A) an inhibition of photosynthesis. B) a disruption of the Calvin cycle. C) a blockage of water transport. D) an inhibition of respiration. Title: Re: Multiple choice question [urgent] Post by: carriescarats on Feb 21, 2015 C - The xylem deliver water and nutrients, therefore the 'plugs' the tree creates in an attempt to stop the fungus from spreading will also block its ability to transport nutrients and water up the trunk, eventually killing it.
Title: Re: Multiple choice question [urgent] Post by: iMMORTAL153 on Feb 22, 2015 As stated by Carriescarats they answer is C.
The xylem transports water and mineral from roots to aerial parts of the plant. The phloem transports. food and nutrients such as sugar and amino acids from leaves to storage organs and growing parts of plant. |